III. Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.

1. He is a _______ biologist . He spends all his life studying sea plants and animals.

A. ocean B. marine C. botany D. sea

2. Sperm whale populations are at risk due to hunting.

A. in danger B. in fewness C. in extinction D .on the decreased

3. _______ is a chemical used for killing weeds.

A. Pesticide B. Herbicide C. Fertilizer D. Antibiotic

4. Some whales migrate into warm waters to bear their _______ .

A. youngs B. diets C. calves D. young whales

5. _______ is the variety of different types of plant and animal life in a particular region.

A. Herbicide B. Interaction C. Environment D. Biodiversity

6. Whales like to feed in the cold oceans where there is a lot of krill.

A. sea plants B. small fish C. tiny shellfish D. small animals

7. Some tiny organisms are _______ along by the currents.

A. carried B. taken C. flowed D. moved

8. These birds ______ to North Africa in winter.

A. settle B. go C. relocate D. migrate

9. Sperm whales are ______, which means they eat meat.

A. herbivores B. carnivores C. omnivores D. mammals

10. Linda has a bad cold. She ____________ out in such bad weather .

A. shouldn’t go B. should take C. should go D. shouldn’t take

11. I think he ______ home tonight because his mother was sick.

A. should ride to B. should stay C. shouldn’t stay D. shouldn’t go out

12. He always has difficulty getting up early. – He ______ up late .

A. should stay B. shouldn’t go C. should go D. shouldn’t stay

13. You _______ Mark . You know it’s a secret.

A. should tell B. shouldn’t tell C. couldn’t tell D. might tell

14. I think this job is suitable for you. You ______ for this job .

A. shouldn’t apply B. should apply C. should look D. shouldn’t look

15. Mr. Nam has a bad cough. He ______ smoking .

A. shouldn’t stop B. should continue D. should give up D. shouldn’t give up

16. Her salary is very low. She _______ another job .

A. should look after B. should look at C. should look in D. should look for

17. If I_______ his phone number, I would call him.

A. know B. knows C. knew D. known

18. If we don’t maintain this biodiversity, the undersea populations would be_______ stake.

A. on B. at C. with D. from

19. The sea bed _______ here to 5000 meters.

A. deep B. deepens C. deeper D. depth

20. She gave me a_______ look and said nothing.

A. mysteriously B. mystery C. mysteries D. mysterious

21. Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word.

Harmful insects must be eliminated to protect our crops.

A. got rid of B. protected C. raised D. cultivated

22. Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined word.

Keep only fish that you will eat; release the rest.

A. have B. hold C. take D. catch

Trình bày phương pháp nhận biết các muối halogen?

nêu cấu tạo và giải thích của máy phát điện xoay chiều?

Người ta làm thí nghiệm như sau: Đặt một tấm lọc đỏ song song với một tấm lọc màu lục. Chiếu một chùm sáng trắng qua tấm lọc màu đỏ.

a) Hãy cho biết màu của ánh sáng thu được sau các tấm lọc màu trong thí nghiệm.

b) Hãy dùng kiến thúc đã học để giải thích kết quả củ thí nghiệm.